William t



w. T. MADDOX. PERPETUAL CALENDAR. APPLICATION FILED MAR- 22; I922.

Patented Nov. 14, 1922 William T. Madijclx Patented Nov. 14, 1922.

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YERPETUAL CALENDAR;

Application filed mime, 1922. Serial-No; 545,867.

To all whom it may concern.- 7 v Be it known that I, WILLIAM T. MADDOX, a citizen of the United States, residing at Alexandria, in the parish of Rapides and State of Louisiana, have invented certain new and useful Improvements in Perpetu l Calendars, of which the following is a Specification, reference being had to the accompanying drawings. v

This invention relates to calendars, and particularly to what is known as perpetual calendars, and the the object of my invention to provide a calendar which is truly perpetual, that is which is'applicable for use for all time. i

A further object is to provide a calendar of this character which is very simple,-compact, and which requiresbut sim le manipulation in order to set the 'calen ar to indi cate the day of the month upon which'any particular event will fall or the day of the week upon which any event will fall from the year 1901 to infinity, and which isadapted to be used as a regularcalendar'for any month of any year. i

A further object is to provide a perpetual calendar for all time composed of seven one hundred year calendars, making a seven hundred year calendar which, at the expira,

tion. of seven hundred years, repeats itself ad infinitum. 1

lrly invention is illustrated in the accompanying drawings, wherein Figure 1 is a face view of 'a' perpetual 2 calendar constructed in accordance with my invent-ion;

Figure 2 is a face view of the section B of the calendar enlarged. I 1

Referring to these drawings, it will be seen that the calendar is divided by transverse lines 10 into a series of transverse spaces, each transverse space being divided into seven spaces 11 and. there being seven of these series of spaces 11. There are thus 49 spaces 11 and each space 11 is divided by vertical lines into seven columns 12, these columns registering with. each other from top to bottom ofth'e calendar.- At the top of: the calendar above the seven 'columnsll there are seven spaces 18 having therein certain index letters. vliteading from the left, I have used the index letters R, D,N, E, L, A, and K. These letters, howeve are purely arbitrary, but selected by me because the same letters reversed in order vi vill approximate the spelling of calendar. Each vertical column of spaces 11 isfse'parated from the adjacent.

vertical columns preferably bydouble lines 14 or other distinctive lines, and each trans- .verse series of spaces is separated, from the next adjacent transverse series of spaces by double lines 15 or other obvious lines of separation.- Atthe lower endsof each of the columns 11 there is provided a series of seven, spaces 16 which I have indicated as 66. b, 0, (Z, c, f and 9, containing the names of the months. The space a is forApril and. July, the s ace 5. for October, 0 for August, d for arch and November, 6 for ;May, f for June, and g for Septemberand December. The month of January is indicated. at the top of both of the spaces a and 7)., themonth of February is indicatedacross the top of both of'the spaces 0 and 03, so

that leap years may be read properly upon the calendar, as will be hereafter indicated;

The spaces a to g arealso numbered 1 to 7 consecutively.

At, the extreme left. hand margin aof. the lettered columns R, D, N, E, L,,etc., there is a column designatedl? intersected by the, lines 15, thus making seven spaces 18 At the head of the lowermost'space is indicated the year 1901,-at the head of the second space from the bottomv theyear 2001. at the" head of. the third space from the bottom 2101, heading the fourth space from the bot tom is the number 2201, at thehead of the fifth space-is 2301, the sixth 2401 and the 1 seventh is 2501. After the expiration of these centuries, 2601' will take its place in the space with 1901 repeatingall that had" expired before, and so the other century years in the margin should be increased by 700 to take their proper places in the spaces allotted to "them and thus make thezcalendar, continuous for all time; Below the numeral 190 1 in the lowermost space 18 is the year 2601, the next column above has the year 2701, and so forth up to the uppermost space 18. which hasthe year 3201, 3301 being in the lowermostspac'e.18,-etc., as indicated fully in the drawing. All of the transverse series of spaces 11 and indicatedby-the letter B, for instanceyapply to the years 1901,

2601,3301, 4001;. 4501,,5401, e101, end such divided into seven vertical columns 11 may be completely filled out with year numbers, this 18 not necessary, and preferably and in order to make the calendar more compact,

only one of these spaces 10 is filled out, that is the space on the extreme left hand lower corner of the calendar. columns 12 of this space are filled in with year numbers and it is not necessary to do more than indicate the last two numbers of the year, as for instance 01, 22, a4, 72, etc. These figures increase in value from the lower end of the column upward and the figures which indicate leap years are indicated in de faced typeor in type of a distinctive color.

It will be noted that the lowest figures of the several columns in this space 11 at the extreme left hand lower corner of the cal endar will be consecutively 01, 02, 03, 09, 0 1,

05 and 06. Reading across the calendar, the next succeeding space 11 has the figures 0 01, 02, 08, 09, 04 and 05 at the lower end of the respective columns. he next succeedmg space or the space above the month of August has the figures 0a, 05, 06, 01, 02, 03 and 09 at the base of the columns, etc, the position of the figures from 1 to 9 advancin%one space for each month.

eading upward to the successive spaces 10 above the space 10 at the lower left hand corner of the calendar, it will be seen that in the lower end of the fiI'S C COllUHII of the lowermost space is the numeral 01, in the next space there is the numeral 02, in the next space 03, the next space 09, the next space 0 1, the next space 05, the next space 06, in other words'the figures for successive centuries at the feet of the columns 10. are the same as the arrangement of the figures in the seven. columns 11 of any single space 10 reading transversely.

It will be noted that each transverse series of spaces 10' constitutes a complete cen tury column. Thus, for instance, the first transverse series of spaces or sections B contains calendar numerals which are applica ble to the entire century from 1901 to 2001. They are also applicable to the entire century from 2601 to 2701 and to the entire century from 8301 to 3401 and so on. Disposed below the series of columns and the month spaces but located in any suitable position on the calendar is a rectangular space '19 which is divided into 35 spaces by vertical and transverse lines, these spaces being filled with the numbers l to 31 of the month. Above this space 19 the material of 1 ,asaaes the calendar is cut to provide two slits 20, and slipping through these slits is a strip 21 having thereon 26 spaces arranged in two horizontalrows. The first series of-spaces are lettered with the same letters as are disand shifted longitudinally to bring any par- 7 ticular day of the week or any particular day indicated letter above any of the vertical columns of the monthly calendar 19.

It will be seen that l have used 700 years as a unit. The reason for this is that I'have found that 700 is the only number which may be divided by 28 into centuries without a remainder, I use the number 28 for the reason that I have found from another cal.- endar of my manufacture that the calendar repeats itself every years and 1 divided centuries by 28 until I found that 700 was divisible without a remainder. Inasmuch as there are 80 days in a month and as there are seven days in a week, it is evident that some months must run along with other months a part of the time and with still'other months at other times. Therefore, it will beseen that January runs along with April I and July inleap years and with October in years that are not leap years. Hence in looking for January in a year that is a leap year, the year will. be found in the section 1, and in looking; for a date in January where the year is not a leap year, the year will be found in section 2, The sameis true with regard to February in sections 3 and 4;.

It will be obvious that the abbreviations v for the days of the week might be disposed at the upper ends of the columns 11 instead of the arbitrary letters so disposed, and it will be seen by reference to the left hand lowest section that the columns 11 correspond to the days of the week and that the sections correspond to the various months, this particular section at the lower left hand corner corresponding to the months of April, July and January of a leap year, and that the year numbers are arranged in these columns in'accordance' withthe day upon which the first day of the months associated with the columns will fall on any particular week day. Thus, for instance, by reference to the first column of the series, it will. be seen that the first day of April or July in the years O1, 07, 12, 18, 29, 35, 10, 46, etc., andithe first of January in the leap years 12, 40,168 and 9.6 will come on 'Monday,.and byreference :to thesecond column that the first day of left hand lower section, reference maybe easily made to any other section and to-the proper column in any other section without the necessity of filling all the other sections with year numerals. v a

number of examples will "indicate :the manner in ivhich the calendar is used and its value. If it be desired to set the monthly, calendar for the month of February,1922, find the numeral- 22 in the century calendar B, section 1. It will be seen :that this numeral 22 is found in thesecond column from the right hand side. At the lower end of this column will he'found the numerals .05. By now looking under the month column February in the section 4 v(for the reason that the year 1922 is not a leap year), the :nu merals 05 will be seen. This numeral 05 comes under the letter 1T at the top of the calendar; The strip '21 .is nownshifted ,until the letter N is brought abovethe first 'day of the month in the space 119., and the month-1y calendar consisting ofthe strip 21having the days of the weeks thereon and the space 19 having the dates of the month thereon Will be set for the month .of "February, 1922. This strip remains set during the month of February and when a-change 'is requirechas for instance for the month of March, the same manipulation isamade In other-fiends, the strip is shifted so vas to :bring the days of the week, as indicated on the strip, into proper relation to the days of the month.'as indicated in the space 19. It is obvious that by shifting the strip 21 over the monthly calendar 19 in accordance'with the daysg that the days of the Week in any month or any year from 1901 ionward may be indicated.

For instance, if it be desired to set the monthly calendar to show What relation the days of the Week will bear to the days of the month for the year 2201 and the month of January, then by reference to the calendar it Will be found that the year 01 is not a leap year. Therefore, reference is made to, section 2 instead of section 1, and referring to the transverse series of columns for the year 2201, it will be seen that 01 (of the second section) occurs beneath the letter A, and if now the strip 21 be shifted so that the letter A, is disposed above the first day of the second column from their '1 January, 2201, will .be indicated.

=-month in; the space 19, thenthe calendarzfor Having seen how the calendar may :be manlpulated to indicate the relation .Ofathe dayslof the Week for any particular month i for any particular year, it wwill Abe shown how the calendar applies to Working out other problems For instance, suppose it is desired to'know What day-of the wekifellso'n "October 25%,1901. Again ,reference'is matie to the section ,1, and looking-through the see- 7 tion it is foundrthat the year 190 occurs a at the bottom oftheiirst column TBGfQI-GIIQG is now made to section 2HforwOctober and *the reference numeral 01 is found at'thedoiyer end of "the sec'ondicolumn whlchwisiheaded by the letter D. If now the strip 251,;be

,upon which Ghristmas,19,22, wil'lfalh by referring to section A, '22 ivil the numerals 05., Referring :to section over the heading December and :to the 10.01- "um'n marked 05, it Will ib seen thatthisicolumn is headed by the letter L. "Settingithe' strip 2 1 so that the :letter Lis'onerthe first of the month, the calendar is setfor'llecemher 22nd and it will", be seen-"that the 2'5th Willoccur'on Monday; 12- r I f a note for $150 was/drawn payable on June 13, 1926, on What day :of the \veelmvi-ll tion 1 and -lookingfor the year nu-mhe'rw26, this year number is foundin the fourth .001-

a so i res it become due? Again referring tQ llihG'JSG G- umn from thelrigiht and'at :the foot ioflthis column is the year nu-mbe1w09.Loolcing rimder the section 6 forthe month 30f Julienne for the numeral 09, it is folmd that thisnw moral is in the second'colunm headed by'the letter B, and setti-ngflthestrip' '21 with the letter ahoverthe firstwday the month, it ill heseenthritthe il3th will fall on Sunday so that the note cannot ibecol lected'.

Let the question-be, -Wha t Will he the tnrru setting the calendar for May, 19.29.,it will he seen that Friday, the 10th, is the third day of the second Week. Upon what day of the I fore remarked, 1940 is a leap year. Therefore, in making reference to the month of February, it Will be necessary to look in section 3 and 01 willbe found in the fourth 115 day 'ofthe secondweek in May, 1929 By a a days fall in 1929? tersect.

space from the left hand end of this section,

which is headed by the letter Setting the strip 2], so that the letter E is above the first day of the month, it will be seen that February 22, 1940, will fall on Thursday. 2

Problems such as the following can be easily worked out by the same principle: What is the next lea year in which January 16th will come on ednesday, and what is the next year that is not a leap year on which January 16th will fall on the same day? Upon what dates of the month will Tues- What will be the next date when March 4th will come on Sunday? When will be the first Monday after the second Thursday in October, 1922, etc These problems will indicate the great diversity of questions which will be answered by this calendar.

It is not necessary to fill every section with numerals, as is the section B, as the numerals at the bottom of ea h column in a section have exactly the same years in the column with it, and this is all over the calendar. Thus there is no necessity of more than one set of figures, if the bottom figures only were used to take the place of the whole section of figures. It is then possible only to refer to these bottom figures for the year and whatever column these figures are in if it has at its foot a numeral which would in dicate by reference to the proper section for the proper year and month the day of the week upon which-the first day of the month. would fall for that particular period, that is where the century and the'month would in- WVhere the year number is no larger than the numerals at the foot of the dif ferent, columns of years in the section, there is no need to refer to section B but reference can be immediately made to the proper 1 ,as a ,aas

I claim l. A calendar including a transversely extending series of sections, each section having associated therewith the name of a month, one of said sections'being divided the days of the month from 1 to 31, and ashiftable slip associated with the complementary calendar and having thereon the same week day indicating figures in the same order as are used to head the columns.

2. A calendar including a plurality of" series of seven transversely extending sec-- tions, each series having sections z-irranged in alignment with the like sections of the next adjacent series and there being seven series of sections, all of the sections in alignment with each other being divided by vertical lines into seven spaces, each space .being headed. by a figure denoting a week day and each of said sections being asso ciated with the name of a month, each ofthe transverse series of sections having associated therewith year numerals denoting in tervals of 700 years, the year numerals of each transverse series differing from the year numerals of the next succeeding transverse series by intervals of 100 years, one of said sections having in its seven vertical columns year numerals for 100 years, each column having therein the year numerals indicating those years upon which the beginning of the month associated with the column will fall on the week day appropriate to the column, a complementary monthly calendar having indicated thereon the days ot-the month from 1 to 31, and a shiftable slip associated with the monthly calendar and having thereon the same week day indicating figures in the same order as are used to head the columns. i

In testimony whereof I hereunto atfix my signature.

WILLIAM T. MADDOX. 

